To provide a device enabling a learner of multiplication table to experience the joy of finding a mathematical regularity by himself/herself or to experience unexpected mathematical depth by utilizing, as an exploring activity, the process where a table is used for the process of checking the relation between the multiplier and the multiplicand.
A learning tool for visually checking the result of regular arithmetic operation in a multiplication table by introducing the concept of logarithm where the product can be expressed by the sum is provided. The multiplication table learning tool comprises, as shown by the signs 1 and 2 in Fig. 3, a display body having a face displaying the entire relations in the multiplication table in a two-dimensional drawing, and a slide rule to be used in a superposed state, and a logarithmic scale in the same reduction scale is marked on each of them. As shown by the signs 1k and 2d in Fig.3, marks functioning as a mechanism for setting the use position of the slide rule for each multiplicand are provided on the display body and the slide rule and, by setting the position of the slide rule, the value of the product of multiplication is read. A user can take an overview of the entire relations in the multiplication table and can intuitively explore the regularity.
AIZAWA NORIYUKI
KAMOGAWA HITOSHI
FUKAMIZU ERIKO
AIZAWA NORIYUKI
KAMOGAWA HITOSHI
FUKAMIZU ERIKO